Newly declassified records show that on November 21, 2008, “an Arabic gentleman” posing as an investigator for an never identified Atlanta law firm. The caller, seeking information as to "whether Flint Hills could track where the gas tankers were going" had a particular interest in BP shipments. His refusal to give a last name or state which legal firm he was working made the answering Flint Hill Resources employee suspicious causing him to refuse to give out the requested information and call in the FBI which launched a highly-classified investigation.

The six-month investigation by the FBI was ultimately closed without charging or identifying anyone after the FBI's Milwaukee field office decided that it had "exhausted sufficient investigative resources" and that "no potential criminal violations or priority threats to national security warranting further investigation were identified."